$\lim_{t\to0}\left(\frac{e^{3t-1}}{sin\left(t\right)}\right)$
$1+2\sin x\cos x=1$
$\frac{d}{dx}7x^3=5y^2+3y$
$\int\left(\frac{1}{\sqrt{7x-9}}\right)dx$
$\frac{dy}{dx}+\frac{y}{x}=3x+4$
$\left(\sqrt{6xy}\right)\left(\sqrt{4xy^3}\right)$
$\lim_{x\to0}\left(\frac{6}{cosx-1}\right)$
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